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Canadian Daves JustKDX
KDX200 needs help
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[QUOTE="Tom H, post: 606040, member: 19742"] Here is what I did this weekend. First I read the old posts concerning leak down tests. I've never done one cause it appears quite hard to do. My strongest fear was a leaky crank seal, even though I just changed them. So I figured I better due it anyhow. With the help of posts from KDXQuebec and JDbrush, it was surprisingly pretty easy to do. I knocked the porcelean from an old plug, brazed a 1/8" X 2 1/2 brass pipe nipple in it and installed a pressure guage. I got a 1-3/4" expandable pipe plug and corked up the exhaust port. I made a plastic plug out of 1/2 " plastic sheet and put a chrome wheel air valve in it and stuffed it in the inlet port. With the piston at BDC, I pressurized it 10 psi. (Any more and the plugs would blow out. It held pressure what I suspect is pretty good. It took probably 2 minutes to go to zero. I would guess it leaked out the plugs. I am sure relieved the seals are OK. I question now weather or not the seals were ever bad in the first place. But it was probably due for a new set of crank bearings anyhow (I have to justify my efforts somehow, I guess) So I pulled the barrel and re-checked the ring gap. It was around .018". Probably a little loose for rings with maybe 1 hour on them, but not excessive. It had a new head gasket installed when I put it together after splitting the cases. I haven't got it back together yet, but I still suspect it has low compression. I have no idea why. Maybe my compression checking guage is bad. I inherited it from my dad, and hasn't been used in over 10 years. (It feels like it has fairly decent compression when I crank it. In any case, I am still nowhere. I will put it back together and see if something fixed itself (??) for lack of anything else to try. One thing I didn't do was hone the cylinder. I did this because I didn't think you did that to plated bores. I have read that some people do. Could that be my problem? I will post anything more that happens, & accept any more ideas. thank for the help to date. [/QUOTE]
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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
KDX200 needs help
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